Ronaldo, however, has warned that any talk of a walkover for United is ridiculous, especially as the champions are yet to win at The Emirates.
"It's a new stadium and maybe that's the reason we haven't done well there," he said. "So we have to be careful.
"Arsenal are having a tough time but we play with 11 players the same as them and I think it's going to be difficult - they are always strong at home. We have to respect Arsenal because they have great talents."
Kolo Toure insisted Arsenal will prove they can win the League against United on Saturday, even though they have now failed to win at home for three matches.
Toure said: "I played against United already and I know what I have to expect. I think it's going to be a good game and we will show them we are still in the race for the title.
"We are still in there. We are fourth at the moment. It's not a must win game, it is another game. We know that the Premier League is really long - we are not in the second half yet.
"We just have to rely on our play. We play football, we pass the ball try to play with our quality."
Nicklas Bendtner looks set to lead the attack against Sir Alex Ferguson's side, with either Abou Diaby or Mexican teenager Carlos Vela in support.
